Introduction of tunnel fan product features: SDF forced counter-rotating axial flow tunnel fan, it is a new type product developed by Shandong Golden Wind Blower Co. , Ltd. on the basis of summarizing the structure and technical performance of the existing forced tunnel fans in China. The product has reasonable structure, complete specifications, high efficiency, low noise, long air supply distance and other characteristics, greatly reduce the labor intensity of workers, saving ventilation time, tunnel ventilation is the ideal equipment. Can also be used in metallurgy, chemical, mining and other ventilation systems. B main uses and scope of application, this product is mainly used in highway, Subway, mine tunnel ventilation system, for forced ventilation, applied to various mining face and various chambers of forced local ventilation. C specifications, this product is a series of products, specifications, full range, details see SDF series of pressure-type counter-rotating axial flow tunnel fan technical performance table.

1.D type composition and significance take SDF-6.3/22 × 2 type fan as an example SDF-6.3/22 × 2 | Motor Power & number (impeller diameter) of tunnel fan e operating environment, the product can be used on the ground of tunnel, or can be supported on a bracket. The ambient gas temperature of the fan shall be -15 to 50 degrees, the altitude shall not exceed 1000 meters, and the rated frequency of the power supply shall be 50 Hz. F working conditions, the product through the gas dust content does not exceed 200 mg/m3

2.Structural features of tunnel fan a the fan consists of five parts: collector, Inlet Silencer, first-stage group, second-stage group and outlet Silencer. Each stage of the fan is driven by a motor with the same rated power, the impeller is directly installed on the motor shaft, and the rotating direction of the impeller between two adjacent stages is opposite. After the gas enters the first stage impeller to obtain energy, it is accelerated to discharge through the second stage impeller. The rear stage impeller has the static blade function of the axial flow fan and increases the gas flow rate, thus achieving higher air pressure and efficiency. C fan can be disassembled from the middle flange, single-section use, but to pay attention to safety, to prevent foreign matter inhalation leading to impeller damage. 

3. Installation and commissioning of tunnel fan a equipment foundation, installation conditions, installation technical requirements, the fan does not need special equipment foundation, placed in a relatively flat ground or plane can be long-term stable operation, if the suspension installation, the top of the fan lug should be a good bolt, u-hanging steel connection can be good. B debugging procedures, methods and notes, open the motor junction box, according to the motor power selection of the appropriate cable, from the first and Second Chassis Junction Box Threading, through the junction box and motor connection, fix the junction box and tighten the nut. Check all parts of the bolt is complete and reliable, check the completion of commissioning and commissioning work. If need to connect the inverter control cabinet, each inverter control cabinet is connected with a junction box to ensure that the direction of rotation of the impeller and the direction of the arrow marked fan.

C installation, debugging to achieve the requirements 1 impeller and shell radial clearance uniform, ensure that the impeller diameter 0.25% -0.4% . After the installation of the two-stage fan, the distance between the two hubs shall not be less than 9mm 3 the output power of each motor shall not be greater than 95% of the rated power 4 the direction of rotation of the impeller shall be in accordance with the direction mark on the casing D the preparation before trial operation 1 select the proper cable and Switch 2 connect in accordance with the requirements of paragraph b 3 carefully check the impeller pressure cover and other parts of the connection bolt is complete, fasten 4 start the first stage fan, start the second stage fan, run 20 minutes after the shutdown, and then check whether the impeller pressure cap and other bolts are tight, all accurate after long-term operation of the 5 fan belt connected to the outlet of the fan, fixed firmly.

4.Tunnel fan performance parameter table